"Salem's Lot" had some memorable scenes liker you mentioned with Return as well. Most noticeably the dead kid scratching at the window being asked to let in, or the creepy vampire rocking back and forth in the chair hissing "look at me teacher" that one really gave me the creeps.
Gremlins weren't really horror movies but they hold as memorable monster memories as the Tremors movies did for you guys. I thought the Gremlins in 2 particularly were amazing and I grew up watching that movie dozens of times as a kid. I also grew up with "Critters" anyone remember that weird series?
Tumbleweed sized black fur balls with teeth that would put a piranha to shame. The 2nd movie made me barf half the time
. Dead Silence had some creepy moments too, but so far 30 days of night has been the most kick ass, scariest modern horror movie I've seen in a while.